314 lines
16 KiB
JSON
314 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-38177",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T04:51:23.992Z",
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"datePublished": "2025-07-04T12:47:09.127Z",
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"dateUpdated": "2026-08-05T12:00:08.513Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:00:08.513Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch_hfsc: make hfsc_qlen_notify() idempotent\n\nhfsc_qlen_notify() is not idempotent either and not friendly\nto its callers, like fq_codel_dequeue(). Let's make it idempotent\nto ease qdisc_tree_reduce_backlog() callers' life:\n\n1. update_vf() decreases cl->cl_nactive, so we can check whether it is\nnon-zero before calling it.\n\n2. eltree_remove() always removes RB node cl->el_node, but we can use\n RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable path is reached by configuring HFSC classes and child qdiscs via rtnetlink (`tc`) and driving local packet flow through them, which requires local system access. Remote packets alone cannot establish the required qdisc hierarchy.\nAC:L - The attacker fully controls every precondition — the qdisc/class topology, the child qdisc that re-enters `qdisc_tree_reduce_backlog()`, the packet, and the class deletion — and the sibling commit ships a deterministic shell reproducer. This is a reentrancy/accounting bug, not a race the attacker must win.\nPR:L - `tc` qdisc/class operations are gated by `netlink_net_capable(skb, CAP_NET_ADMIN)`, which resolves to `netlink_ns_capable(skb, sock_net(sk)->user_ns, ...)` — namespace-relative, so an unprivileged user obtains it with `unshare -Urn` and can build the full hierarchy on `lo` inside that netns.\nUI:N - The attacker performs the qdisc setup, packet transmission, and class deletion entirely on their own; no victim action or cooperation is needed.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - Dangling `hfsc_class` rb_nodes left in `q->eligible`/`vt_tree` are dereferenced by `eltree_get_mindl()`/`vttree_get_minvt()` after `kfree()`, giving a use-after-free read over reclaimed heap contents the attacker can spray, enabling arbitrary kernel memory disclosure.\nI:H - Double `rb_erase()` on a stale node writes through an attacker-influenceable parent pointer, and subsequent `eltree_update()`/`rb_insert` operate on freed memory — yielding a write primitive; the same HFSC rbtree-corruption primitive has a public working local privilege escalation (CVE-2025-38001, \"rbtree family drama\").\nA:H - Red-black tree corruption and use-after-free on freed `hfsc_class` objects reliably produce oopses, KASAN splats, and kernel panics, taking the system down."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sched/sch_hfsc.c"
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],
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"versions": [
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{
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"version": "959466588aa7f84ccf79ae36a1d89542eaf9aaec",
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"lessThan": "9a5fd5c2f4d4afdd5e405083ee53e0789ce76956",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "959466588aa7f84ccf79ae36a1d89542eaf9aaec",
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"lessThan": "72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "959466588aa7f84ccf79ae36a1d89542eaf9aaec",
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"lessThan": "a5efc95a33bd4fcb879250852828cc58c7862970",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "959466588aa7f84ccf79ae36a1d89542eaf9aaec",
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"lessThan": "0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "959466588aa7f84ccf79ae36a1d89542eaf9aaec",
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"lessThan": "9030a91235ae4845ec71902c3e0cecfc9ed1f2df",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "959466588aa7f84ccf79ae36a1d89542eaf9aaec",
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"lessThan": "d06476714d2819b550e0cc39222347e2c8941c9d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "959466588aa7f84ccf79ae36a1d89542eaf9aaec",
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"lessThan": "c1175c4ad01dbc9c979d099861fa90a754f72059",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "959466588aa7f84ccf79ae36a1d89542eaf9aaec",
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"lessThan": "51eb3b65544c9efd6a1026889ee5fb5aa62da3bb",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sched/sch_hfsc.c"
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],
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"versions": [
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{
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"version": "4.14",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.14",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.297",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.241",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.190",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.138",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.90",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.28",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.14.6",
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"lessThanOrEqual": "6.14.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.15",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.14",
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"versionEndExcluding": "5.4.297"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/9a5fd5c2f4d4afdd5e405083ee53e0789ce76956"
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},
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{
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"url": "https://git.kernel.org/stable/c/72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7"
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},
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{
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"url": "https://git.kernel.org/stable/c/a5efc95a33bd4fcb879250852828cc58c7862970"
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},
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{
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"url": "https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87"
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},
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{
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"url": "https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df"
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},
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{
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"url": "https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d"
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},
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{
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"url": "https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059"
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},
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{
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"url": "https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb"
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}
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],
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"title": "sch_hfsc: make hfsc_qlen_notify() idempotent",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T19:58:30.487Z"
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}
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-38177",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-06-10T20:40:35.261574Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-06-11T18:44:03.284Z"
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}
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}
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]
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}
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} |